Fast Natural Gas Analyzer Nexis GC-2030FNGA1 GC-2014FNGA1

Importance of the Topic

Natural gas composition analysis plays a critical role in energy management, process control and quality assurance. Accurate determination of constituent gases supports calculation of heating value, relative density and regulatory compliance. Fast, reliable measurement methods enable operators to optimize performance and ensure safety in production and distribution networks.

Objectives and Study Overview

The study describes the development and configuration of a fast natural gas analyzer based on a Shimadzu Nexis GC-2030FNGA1/GC-2014FNGA1 gas chromatograph. The aim is to separate and quantify 15 gas components (He, H2, O2, N2, CO, CO2, H2S, C1–C5 and C6+) within a 10-minute run. Software integration provides automatic calculation of calorific value and specific gravity.

Methodology

Samples pass through four sample loops and a pre-column where C6+ hydrocarbons are back-flushed as a single peak. Valve timing directs C3–C5 hydrocarbons to an Rtx-1 capillary column for FID detection. A packed MS-5A column separates permanent gases O2, N2, CH4 and CO, while CO2, C2H6 and H2S are resolved on an Rtx-Q Plot column with TCD detection. A second MS-5A column isolates He and H2, detected by a dedicated TCD using N2 as carrier. Total analysis time is approximately 10 minutes.

Used Instrumentation

• Shimadzu Nexis GC-2030FNGA1 or GC-2014FNGA1
• Four switching valves and eight columns (capillary and packed)
• Detectors: dual TCD and single FID
• LabSolutions GC workstation with BTU and specific gravity software

Main Results and Discussion

Typical chromatograms demonstrate clear separation of all target components within the specified concentration ranges (e.g., CH4 20–100 mol %, C3H8 0.001–10 mol %). Detection limits meet ASTM-D1945, D3588 and GPA-2261 standards. Fast cycle time and dual-detector configuration yield reproducible quantitation across light gases and C3–C5 hydrocarbons.

Benefits and Practical Applications

• Rapid, one-stop analysis of natural gas compositions in under 10 minutes
• Accurate calorific value and density calculation for custody transfer and process control
• Dual-detector flexibility enables simultaneous quantitation of permanent gases and hydrocarbons
• Automated software reduces operator intervention and potential errors

Future Trends and Applications

Advances may include integration of infrared or mass spectrometric detection to extend component ranges and improve sensitivity. Machine learning algorithms could optimize valve timing and peak deconvolution. Miniaturized or portable GC platforms promise onsite real-time monitoring of pipeline and field samples.

Conclusion

The described fast natural gas analyzer offers comprehensive, rapid and reliable measurement of key gas components. Its modular valve and column configuration, paired with dual detectors and dedicated software, meets industrial standards and supports a wide range of QA/QC and process control applications.

Reference

• ASTM D1945: Standard Test Method for Analysis of Natural Gas by Gas Chromatography
• ASTM D3588: Standard Test Method for Total Sulfur in Light Hydrocarbons
• GPA 2261: Standard Practice for Gas Analysis